[Don't merge] Add Primitives tutorials

[rathishcholarajan]

Summary

Add tutorials for Estimator and Sampler (IQX and Cloud)
(This PR is only for the reference of community team as they are writing nicer tutorials and shouldn't be merged as is)

Details and comments

Adds a new Primitives section under Tutorials with Estimator and Sampler.

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Totals
Change from base Build 1981800402:	1.2%
Covered Lines:	2043
Relevant Lines:	2912

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[daka1510]

LGTM

[jyu00]

Since you mentioned "session" here, perhaps a few words about what it is?

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[jyu00]

Perhaps some words on how the different indices match up, and that they need to have the same length. Also if I didn't already know how session works, it'd be unclear to me the indices refer to the circuits/observables passed in when entering the context manager.

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[jyu00]

We don't have error mitigation yet

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[jyu00]

No example on using a parameterized circuit?

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[daka1510]

Thinking about this more I'm a bit confused about the difference between this code and the existing tutorial code we used to invoke the sampler program

# Specify the program inputs here.
program_inputs = {"circuits": qc}

# Specify the backend name.
options = {"backend_name": "ibmq_qasm_simulator"}

job = service.run(
    program_id="sampler",
    options=options,
    inputs=program_inputs,
)

Is there a conceptual difference between the sampler program and a sampler primitive? How do both approaches relate to each other?

[HuangJunye]

Line #8.    print(bell.draw())

This will not work well if the drawing default option is set to mpl. I suggest changing to print(bell.draw(output='text')) or bell.draw()

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[HuangJunye]

Line #11.    print(psi1.draw())
Line #12.    print(psi2.draw())

Similar to the sampler tutorial, I suggest the following changes.

print(psi1.draw(output='text'))
print(psi2.draw(output='text'))

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